MacDon 742 HAY CONDITIONER - Manual (Page 72)

Form # 46290 Issue 09/05 70
FIXED ROLLER ALIGNMENT
A
B
C
MAINTENANCE/SERVICE
DRAPERS (continued)
Draper Tracking Adjustment: Each draper deck has one fixed roller and one spring-loaded roller. The
spring-loaded roller is located at the same end of the deck as the draper tensioner, and is self-aligning.
Adjustments are not required to this roller. The fixed roller is aligned by re-positioning hardware in the slotted
holes in the rear support arm.
To ensure square alignment for proper draper tracking, measure dimensions (A) and (B) from roller to channel
at front and rear as shown. Align roller by loosening two bolts in rear support (C) and adjusting in slots until
dimensions (A) and (B) are:
12’ to 25’ Headers – equal.
30’ & 36’ Headers – Dimension (B) 3 mm (1/8”) less than Dimension (A).
If drapers still do not track properly with the settings above, it may be necessary to bias the fixed roller
alignment to correct the problem:
NOTE: When adjusting the fixed roller, move in 2 to 3 mm increments. Before loosening hardware, scribe
a mark on the rear arm and the backsheet to measure the amount the roller moves.
• If the draper is tracking back (towards backsheet) at the end of the deck with the fixed roller, increase
dimension (B).
• If the draper is tracking ahead (towards cutterbar) at the end of the deck with the fixed roller, decrease
dimension (B).
• If the draper is tracking back (towards backsheet) at the end of the deck with the spring-loaded roller,
decrease dimension (B).
• If the draper is tracking ahead (towards cutterbar) at the end of the deck with the spring-loaded roller,
increase dimension (B).
NOTE: If the fixed roller is positioned too far off of square in an attempt to
correct a tracking problem on the spring-loaded roller, tracking at the fixed
roller will be adversely affected. In this case, check the draper for
squareness and re-punch draper connecting holes if necessary.
Idler Roller Maintenance
NOTE: When tightening nuts at ends of idler roller,
torque to 30 - 45 ft.lbs. (40 - 60 N·m). Over-
tightening may cause thread to fail.
NOTE: When reassembling idler roller, install both
seals (K) with flat face (with writing) out and install
bearing (L) with shielded side facing out.
INSTALL SEALS WITH FLAT FACE OUT
INSTALL BEARING WITH SHIELDED SIDE OUT
K
L